Magnetic arc-extinguishing means.



O. A. SANDBDRGH.

.MAGNETIC ARC EXTINGUISHING MEANS.

APPLICATION FILED ma. 4, 1905.

93%573, Patented Sept. 21, 1909.

2 SHEETS-SHEET l Fi g. 7.

' WHNESSES: I f lNvENTOR' f iM/f, ff

ATTORNEY O. A. SANDBORGH. MAGNETIC ARG EXTINGUISHING MEANS.

APPLICATION FILED DEG. 4, 1905.

Patented Sepia. 2i, 1969.

2 SBBETS-SHEBT 2.

INVEMOR Apjplxiqgtmmewww@g, mi swing@ mgm.

. States udvgafresdent, legheny, and

mitral Q inY anna: zahlte fsu as: ,mes Damned I fs'x th@ protcion Lof@multiple switch con- 4imo); sys'mpluvolivng a plurality of? circuit 60interrupting, v

E circ-mts at jzfmquent. intervals tra ha drfsfw cated in the' air-gapsformed between the pole pieces and the several intermediate mag netmembers contact arm Q9 and `stationary terminal members 2G and Qt' whichare attached to the frame l by bolts by washers and bushings (see Fig.l). The

` stationary terminal member 26 is provided with an arcmf' terminalpiece QS, the extremity of which is located directly in the magneticcircuit which is provided as indicated above. The movable contact arm.29 is pivotally mounted upon the stationary member 2T and is providedwith a contact piece 30 which is movably connected thereto andcorresponds to the Stationary terminal piece Q8 .with which it mayengage, when an electric circuit is completed from stationary member 27through the movable arm 29, to the stationary member 26. The contactpiece 30 is connected to the stationary member 2T by a tiexible shunt3l, so that the' resistance is reduced between the members and itsmotion about the pivot 32, upon which it is mounted, is limited by aconnecting 'rod one end of which is attached to a pivot 3-'1- the centerline of which is slightly removed from that of the pivot 32. and theother end of which is longitudinallyv movable in a bushing with whichthe arm 29 is provided. The terminal piece 30 is rotated about the pivot32, as far as the connecting rod 33 will permit, by a compression spring3G. The terminal piece 30 is moved into and out. of engagement; with theterminal piece QS by a connectingl rod 3T which acts upon the movablearm it) and receives its motion from a piston $38 with which it isconnected. The piston 3S located in a fluid-pressure cylinder 3D andnormally holds the circuit interrupter in its open position-by reason ofa compression spring ltlwhich interposed l between one, end otl thecylinder and the piston. The switch may bev closed by the action offluid-pressure thaty is admitted into the cylinder by a 'alve' 4Q thcoperation of which is governed by an electro-magnet l1. The extremity ofthe terminal piece Sl() moves into engagement with the terminal piece 2Siirst and as the two'memlurs are separated, circuit is tinally broken atthis point by reason ot' the' action ot' thc spring 3h. alreadyexplained. The extremities ot the terminal pieces "J8 and .tl a reseparated slightly from each other whqli the .switch is completelyclosed, .so that ronghcning ot such extremities by arcs will not preventperfect engage ment of the main portions i surfaces.

In order that thc several switches may be electritailly interlocltcd,relay switches are. provided, each of which comprises a contact carryingarm t3 that is pivotally mounted, near its middle point, upon a.stationary pro jcction stt which is supported l'rom the frame g and areinsulated therefrom f ot' the contact and each comprises a movable 1 andstationary engaging contact fingers 47.

011e extremity of the arm 43 is slotted to engage a pin 4:5 on theconnecting rod 37 so that the motion of the connecting rod i1niarts of arocking motion to said arm. The outer extremity of the arm 113 isprovided with contact pieces 4G which engage the stationary contactfingers 4T.

The stationary members 26 and 27, together with the movable arm Qt) ofeach switch, are surrounded by a box 48 of insulating material, which issimilar to and is assembled between the boxes 25 in which themagnetizable core members are located. By4 locating the. several switchmembers and the various core members in separate boxes, any one may bereadily removed and replaced in case oi" accident to its parts, which isof decided advantage. particularly in railway vehicle service. Themagnet coils 2, 3, 4, 5, T, S, t) and 10 may preferably be wound withcomparatively large size strap conductor of relatively t'ew turns sothat the resistance ot the windings connected in series is comparativelylow and may be included in the motor circuit without appreciable loss.

In order to support the series switches and their parts, the frame 1must have considerable section of material which adequately serves as areturn circuit for the linx induced by the several magnetizing coils,and although the magnetic lines may be considerably scattered throughthe return portion of the circuit. they will obviously be concentratedat the pointsl of circuit interruption so that relatively large currentsmay be flowing through the circuit at the time ot interruption without.materially damaging' the contact terminals, .since the arcs, which wouldotherwise occur to a greater or less extent, are extinguished' inaccordance with well known principles.

lt is sometimes desirable to protect certain ot thc circuitinterrupters-independently on account of the necessity for reversing thecurrent: therethrough, and in that case, an intermediate projection ofmagnctrizable matcrial,'such as projection 1Q, which is provided withpole pieces :9.2 and 15, may be introdtwed between the end projectionsll and 13. li'hen this project-ion is introduced, as lshown in Fig. 3,the magnetizing windings Sl and 10 are connected together and in serieswith the interrupter which is located between them anda magneticcircuit; is induced through pole piece 16, project-ion 13, a portion ot'yoke l, projection l2 and pole piece 15, while the main magnetic linxproduced by the windings Q, 3, 4, 5, G, 7 and 8 passes through polepiece 14 and intermediate inagnet men'ibers 17, 18, 19, 2O and 21, polepiece 29, projection 12, yoke l and the projection 11. With thisarrangement, it is possible to protect an interrupting device which maybe located in the air-gap between magnetic lll() spirit `of my inventionshall be included` essere -the windings 2, 3, 4, `5, 6, 7- and 8.

Although I have illustrated and described my invention in ,connectionwith a multiple switch group, such as is employed for the 'controlofiailway Vehicle motors, it is not restricted thereto and may beadvantageously applied for the protection of circuit interruptingdevicesin' eneral, and I desire' that variations which o not depart from thewithin its` scope. y

Iclaini as my invention:

'- 1: In a controllerfor electric circuits, the

combination with a plurality of independently actuated and electricallycontrolled switches, comprising aseries of stationary contact terminalmembers and corresponding movable contact members, of means for eX-tinguishing electric arcs atthe terminals of, the Contact members saidmeans comprising n plurality of magnetizable members severally locatedbetween adjacent switches, a series of niegnetizing windings for saidmem bers and a suporting frame forthc various switch parts w ichconstitutes a return inagnetic circuit. l y 2. In e controller forelectric circuits, the

` combination with ay plurality of independeiitly actuated switches eachof which coinprises estationary contact member, a movn able memberhinge-connected thereto, a second stationary Contact member, a'terminalmember yieldably connected to said movable memberand adapted to engagethe second stationary member, a fluid-pressure cylinder,

a piston in said cylinder and a connectingrod havingy its extremitiesattached, respectively, to the movable member and to the piston, ofmeans for extinguishinhr electric arcs at the terminals' of the Contactmembers, said means comprising a plurality of magi netizable membersseverally located between adjacent switches and near their terminals, a.series of magrietizinnl coils which surround the magnetizable membersand induce a magi;- netic field therein and ay supporting 'traine forthe variousswitch parte which constitutes Li return circuit for themagnetic flux induced by the magnet coils. A.

I3. ln n control system for electric circuits, the coml'iination with a`plniility of interrupting devices comprising' stationary contactmembers and movable contact members -adapted to engage said stationarymembers, of means for extinguishing electric arcs at the terminals ofthe contactmembers said` means comprising a. plurality of magnetizablemembers severallylocated between adj acent switches and near theirterminals, a series of magnetizing coils which surround theinagnetizable members and induce a magnetic eld therein and a.supporting frame `for the various switch parts which constitutes areturn circuit for the magnetic linx induced by the magnetcoils. l

4. In a controller for electric circuits, the

vcombination with a plurality of independently lactuated switchescomprising a stationary contact member, a movable member hinge-connectedthereto, a second stationary contact meinben, a terminal memberyieldably connected to said movable member and adapted to engage thesecond stationary memberfa i' Hui d-pressure cylinder governed by inelectricallyactuated magnet valve, a

piston in said cylinder and a connecting rod,l

the extremities of which are attached respectively to the movableiiicinber-aiid' to the piston, a. contact-carrying arm pivotally mountednear its middle point, one extremity being so connected to saidconnecting rod by a lost motion connection that the motion of theconnecting rod produces a rocking niotion in said arm, contact piecesmounted uhon the Ophosiie ,Phd or' thc arm and insu lated therefrom. andstationary lingers that engag'esaid ieces. of means for extiiiiguishingelectric arcs at the terminals of the contact members said meanscomprising a plurality of inannetizable members located bctwecn theseveral switches near their terminals. a series of nmgnctizingr. coilswhich sui'- roniid the iimgnetizablc members and induce a magneticlieldtherein, and `a supporting; irnine for the various switch parte whichconstitutes a'i'clulii circuit 'tor the magnetic linx induced by themagnet coils.

lnieslimony whereof. l have hereunto subscribed my naine this 29th dayofNovember, lill-)5.`

OL() l? A. SA N DBORtli-l.

lVitiiesscs:

llfownnn li. Busen, Binner' lliivics. v

